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J. E. SNGHAL.

. PNBUMATIG TIRE,

No. 527,130. Patented Oct. 9, 1894x FIG- 1. FISE.

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tu: Nonms PETERS ca. Pmrmuruo. wssulnamrl, D. C.

FIGB.

' UNITED STATES PATENT EETCE..

JuLEsEMiLE SNECHAL,` oF PARIS,V FRANCE.

PNEUMATIC TIRE.

SPECIFICATION lformingpart of Letters Patent N o. 527,130, dated October 9 1894. Application ined .Tammy 25, y1894. serinnamaoia (No man.) Patented 'in rmceneoember 6.1892, No. 226,202.

To all whom it may concern: l g l Be it known that I, J ULEs EMILE SNCHAL, of the city of Paris, France, have invented Improvements in Pneumatic Tires, (for which I have obtained Letters Patent in France for fifteen years, dated December 6, 1892, No. 226,202,') of which theffollowing is a full, clear, and exact description.

This invention is designed to obviate the disadvantages inherent to the circular form of infiated tire which too readily lends itself to perforation by making the tire of some` other form preferably an approximately rectangular or trapezoidal sectional form. In order to obtain a cross sectional form other than circular, I .connect the opposite 'sides of the airchambeigtogether by inextensible transverse connections which limit the lateral expansion of the air chamber and so prevent it assuming the circular form, as hereinafter described andillustrated in the accompanying drawings forming part of this specification.

Figure l shows for purpose of comparison an ordinaryairchamber of circular section when inflated. Fig.2 is a similar section of an ordinary tire having a steelribbon between the air tube and sheath, and showing how, by the form assumed when passing over a stone, the air tube is liable to be cut by the edges of the ribbon. Fig. 3 is a cross section of a tire of trapezoidal form in section, constructed according to my invention. Fig. 4 shows a modified arrange-ment in vwhich several air chambers are superposed. so as t0-` gether to form a tire of trapezoidal section.

Referring to Fig. l, n represents an inflated rubber tire. Under the action of the internal pressure the sectional form of the tire d when' iniiated will be circular, even although this section before inflation was ellipticah' oval or other form. If inward radial pressure be applied to the inflated tube d (Fig. 2) supported on the rim b, itwill assume the form indicated in said ligure and as this change of shape will occur every time the wheel passes over an obstacle the continual fretting of the air chamber ct and sheath fagainst the edges c cl of the metallic ribbon e interposed between them will cause them to wear which is` more dangerous than the perforation of. the tire.

The invention consists in.means whereby the tire is prevented from assuming the ordi- `nary circular form and is caused to take aninextensible material so as to limit the expansion of the tube in the lateral direction. The same result is attained by superposing several air chambers, three for example, as shown 1n Fig. 4. These chambers or tubes 'i 7c lare of' different diameters and united by strips'of canvas m cemented thereto sov as to formin extensible transversely extending divisions. These combined air tubes or chambers communicate with each other by means of orifices n and are inclosed' in a rubber canvas-lined sheath o mounted on the metal rim lo. The tread portion of this sheath is lined with a steel ribbon q previously incased in 1eather, can vas, or other material in order to avoid hability of cutting by the edges ofthe fiexible strip.

For further security and to obviate the llability ofslipping when wet, the tread of 'the sheath'o may have riveted or cemented to it an outer band r of leather, ribbed-or other rubber, or other-suitable material which 1s easily replaceable and protectsl the sheath from wear.

The air chamber proper whether divided by strips connecting its opposite sides or composed of superposed tubes in communication by one or more holes will as well as its sheath retain when inflated the original sectional form adopted whether rectangular, trapezoidal or other. As the divisions connecting the opposite sides of the tire are inextensible the intermediateportions only of the sides can expand laterally and give the tire a bellows-like form, and the tread being flat the sheath and air chamber are not caused to lap round the edgesof the steel ribbon so that all danger of cutting from this cause is avoide and the perforation of the air chamber isrendered impossible. This new bellows forms a permanently flat tread of tire with interposed steel ribbon, is superior to all others and possesses greater fiexibility combined with absolute security. Steering can be effected without dragging on the roughestroads and sharp curves.

Having now particularly described and as; certained the nature of the said invention and IOO in what manner the same is to' be performed, I section and in open communication with each declare that what I claim is other, said tirehaving a [iat tread and a metal 1. A pneumatic tire consisting of a series strip interposed between the outer chamber 15 of separate superposed air chambers polygoand said tread, substantially asaud for the 5 nal in cross section and in communication purposes specified.

with each other, substantially as described. The foregoing specification 0E my improve- 2. A pneumatic tire consisting of a series ments in pneumatic tires signed by me this of superposed chambers polygonal in cross 10th day of January,l894. section and in open communication with each JULES EMILE SNCHAL. Io other, substantially as describedwl Witnesses:

3. A pneumatic tire consisting of a series CLYDE SHROPSHIRE,

of superposed chambers polygonal in cross ALBERT MOREAU. 

